/* filepath: games/ice-slide/css/style.css */
/* 极地冰面推箱工坊：极光天空 + 冰封湖面 + 科考站仪表 + 雪橇托盘。
   平台基调：沉浸深色调、实体微浮雕、柔和环境光晕；本作独立极地个性。 */

:root {
  --bg-deep: #081d2e;
  --bg-mid: #10334e;
  --bg-high: #175176;
  --panel: rgba(150, 214, 240, 0.08);
  --panel-strong: rgba(150, 214, 240, 0.14);
  --line: rgba(160, 225, 250, 0.2);
  --line-strong: rgba(160, 225, 250, 0.38);
  --text: #e9f6fc;
  --text-dim: #a3c8dc;
  --accent: #6ef0dc;
  --accent-deep: #2bb8a4;
  --amber: #f0b04a;
  --warn: #ffb454;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(4, 18, 30, 0.45);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100dvh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(120% 80% at 50% -10%, var(--bg-high) 0%, var(--bg-mid) 42%, var(--bg-deep) 100%);
  overflow-x: hidden;
}

/* ---------- 极光天空 + 雪花微尘（环境层） ---------- */

#aurora,
#snow {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

#aurora {
  background:
    radial-gradient(38% 22% at 18% 6%, rgba(110, 240, 220, 0.16) 0%, transparent 70%),
    radial-gradient(30% 18% at 72% 10%, rgba(120, 170, 255, 0.14) 0%, transparent 70%),
    radial-gradient(26% 16% at 46% 2%, rgba(180, 255, 220, 0.1) 0%, transparent 70%);
  animation: aurora-drift 26s ease-in-out infinite alternate;
}

@keyframes aurora-drift {
  from {
    transform: translate3d(-2%, 0, 0) scale(1);
  }
  to {
    transform: translate3d(2%, 1.5%, 0) scale(1.06);
  }
}

#snow span {
  position: absolute;
  top: -6px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(230, 250, 255, 0.55);
  box-shadow: 0 0 6px rgba(200, 240, 255, 0.5);
  animation: snow-fall linear infinite;
}

@keyframes snow-fall {
  from {
    transform: translate3d(0, -6px, 0);
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  88% {
    opacity: 1;
  }
  to {
    transform: translate3d(22px, 102vh, 0);
    opacity: 0;
  }
}

/* ---------- 布局骨架 ---------- */

#app {
  position: relative;
  z-index: 1;
  max-width: 1060px;
  margin: 0 auto;
  padding: 14px 16px calc(16px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ---------- 科考站顶框 ---------- */

#topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}

.home-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
  white-space: nowrap;
}

.home-link:hover {
  color: var(--text);
  border-color: var(--line);
  background: var(--panel);
}

.home-arrow {
  font-size: 15px;
}

.brand {
  flex: 1;
  min-width: 0;
  text-align: center;
}

.brand h1 {
  margin: 0;
  font-size: 19px;
  letter-spacing: 0.06em;
  text-shadow: 0 0 18px rgba(110, 240, 220, 0.35);
}

.brand p {
  margin: 2px 0 0;
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.14em;
}

.top-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.icon-btn:hover {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  box-shadow: 0 4px 14px rgba(110, 240, 220, 0.18);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

/* ---------- 模式轨 ---------- */

#modebar {
  display: flex;
  gap: 8px;
  align-items: center;
}

.mode-tab {
  flex: 1;
  padding: 9px 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.15s ease;
}

.mode-tab:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.mode-tab[aria-pressed="true"] {
  color: #06251f;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(110, 240, 220, 0.3);
}

/* ---------- 科考站仪表（HUD） ---------- */

#hud {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1.4fr;
  gap: 10px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}

.meter {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.meter-key {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.16em;
}

.meter-val {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.meter-val.small {
  font-size: 17px;
}

.meter-val.bump {
  animation: bump 0.22s ease;
}

@keyframes bump {
  40% {
    transform: scale(1.16);
    color: var(--accent);
  }
}

#hud-par.near {
  color: var(--accent);
  text-shadow: 0 0 14px rgba(110, 240, 220, 0.55);
}

.stars-preview {
  display: flex;
  gap: 4px;
  font-size: 20px;
  line-height: 1;
  color: rgba(160, 200, 220, 0.28);
}

.stars-preview .star.on {
  color: var(--amber);
  text-shadow: 0 0 12px rgba(240, 176, 74, 0.6);
}

.progress-track {
  height: 8px;
  border-radius: 99px;
  background: rgba(8, 29, 46, 0.6);
  border: 1px solid var(--line);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent-deep), var(--accent));
  box-shadow: 0 0 10px rgba(110, 240, 220, 0.5);
  transition: width 0.25s ease;
}

#level-badge {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  border-top: 1px dashed var(--line);
  padding-top: 8px;
}

#level-name {
  color: var(--text);
  font-weight: 700;
  font-size: 14px;
}

#level-chapter {
  letter-spacing: 0.1em;
}

#daily-badge {
  margin-left: auto;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #06251f;
  background: linear-gradient(180deg, var(--amber), #d8902a);
  padding: 3px 10px;
  border-radius: 99px;
}

#daily-badge[hidden] {
  display: none;
}

/* ---------- 冰封湖面棋盘 ---------- */

#board-wrap {
  position: relative;
  display: flex;
  justify-content: center;
  padding: 18px;
  background:
    linear-gradient(180deg, rgba(150, 214, 240, 0.1), rgba(8, 29, 46, 0.32));
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  box-shadow:
    inset 0 1px 0 rgba(230, 250, 255, 0.22),
    inset 0 -14px 28px rgba(8, 29, 46, 0.35),
    0 18px 44px rgba(4, 18, 30, 0.5);
}

#board {
  display: block;
  border-radius: 12px;
  box-shadow:
    0 0 0 3px rgba(160, 225, 250, 0.16),
    0 14px 34px rgba(4, 18, 30, 0.5);
  touch-action: none;
  cursor: grab;
  outline: none;
}

#board:focus-visible {
  box-shadow:
    0 0 0 3px var(--accent),
    0 14px 34px rgba(4, 18, 30, 0.5);
}

#toast {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%) translateY(8px);
  padding: 8px 16px;
  border-radius: 99px;
  background: rgba(8, 29, 46, 0.88);
  border: 1px solid var(--line-strong);
  color: var(--text);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  white-space: nowrap;
}

#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

#toast.good {
  border-color: var(--accent);
  color: var(--accent);
}

#toast.warn {
  border-color: var(--warn);
  color: var(--warn);
}

/* ---------- 雪橇托盘 ---------- */

#toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 13px;
  border-radius: 11px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.tool-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: var(--line-strong);
  box-shadow: 0 4px 14px rgba(110, 240, 220, 0.16);
}

.tool-btn:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

.tool-btn svg {
  width: 16px;
  height: 16px;
}

.tool-spacer {
  flex: 1;
}

/* 方向方向盘（点选方向滑行） */
#slide-pad {
  display: grid;
  grid-template-columns: repeat(3, 40px);
  grid-template-rows: repeat(3, 34px);
  gap: 4px;
}

#slide-pad.locked .pad-btn {
  opacity: 0.4;
  pointer-events: none;
}

.pad-btn {
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--accent);
  font-size: 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.12s ease;
}

.pad-btn:hover {
  background: rgba(110, 240, 220, 0.18);
  border-color: var(--accent);
}

.pad-btn:active {
  transform: scale(0.94);
}

.pad-up {
  grid-area: 1 / 2;
}
.pad-left {
  grid-area: 2 / 1;
}
.pad-right {
  grid-area: 2 / 3;
}
.pad-down {
  grid-area: 3 / 2;
}

/* ---------- 弹层 ---------- */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: rgba(4, 16, 26, 0.66);
  backdrop-filter: blur(6px);
}

.overlay[hidden] {
  display: none;
}

.panel {
  width: min(460px, 100%);
  max-height: 86dvh;
  overflow: auto;
  padding: 22px;
  background: linear-gradient(180deg, rgba(23, 81, 118, 0.92), rgba(8, 29, 46, 0.95));
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.panel h2 {
  margin: 0 0 6px;
  font-size: 20px;
  letter-spacing: 0.05em;
}

.panel-desc {
  margin: 0 0 14px;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.7;
}

.panel-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.primary-btn,
.ghost-btn {
  padding: 10px 18px;
  border-radius: 11px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.primary-btn {
  border: none;
  color: #06251f;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  box-shadow: 0 6px 18px rgba(110, 240, 220, 0.3);
}

.ghost-btn {
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
}

.primary-btn:hover,
.ghost-btn:hover {
  transform: translateY(-1px);
}

/* 结算星级 */
.stars {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin: 10px 0 4px;
  font-size: 40px;
}

.stars .star {
  color: rgba(160, 200, 220, 0.22);
  transition: color 0.2s ease;
}

.stars .star.on {
  color: var(--amber);
  text-shadow: 0 0 18px rgba(240, 176, 74, 0.65);
}

.win-flag {
  text-align: center;
  margin: 4px 0 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.1em;
}

.win-flag[hidden] {
  display: none;
}

.win-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 14px 0 0;
}

.win-grid div {
  text-align: center;
  padding: 10px 4px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 11px;
}

.win-grid dt {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.14em;
}

.win-grid dd {
  margin: 4px 0 0;
  font-size: 19px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.win-best {
  margin: 10px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--text-dim);
}

#win-daily-done {
  margin: 10px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--amber);
  letter-spacing: 0.08em;
}

#win-daily-done[hidden] {
  display: none;
}

/* 选关 */
.levels-panel {
  width: min(560px, 100%);
}

.levels-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.levels-chapter-title {
  font-size: 13px
  ;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.levels-chapter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.level-cell {
  position: relative;
  aspect-ratio: 1;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 16px;
  font-weight: 700;
  transition: all 0.15s ease;
}

.level-cell:hover:not(:disabled) {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.level-cell.cleared {
  background: rgba(110, 240, 220, 0.12);
  border-color: rgba(110, 240, 220, 0.4);
}

.level-cell.current {
  box-shadow: 0 0 0 2px var(--accent);
}

.level-cell.locked {
  opacity: 0.4;
  cursor: not-allowed;
  font-size: 13px;
}

.level-stars {
  font-size: 9px;
  color: var(--amber);
  letter-spacing: 1px;
}

/* 玩法说明 */
.help-panel {
  width: min(520px, 100%);
}

.help-body h3 {
  margin: 14px 0 6px;
  font-size: 14px;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.help-body p,
.help-body li {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.75;
}

.help-body ul {
  margin: 0;
  padding-left: 18px;
}

/* ---------- 无障碍 ---------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.noscript {
  position: fixed;
  inset: 0;
  z-index: 99;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--bg-deep);
  color: var(--text);
  text-align: center;
  padding: 24px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 768px) {
  #app {
    padding: 10px 10px calc(10px + env(safe-area-inset-bottom));
    gap: 10px;
  }

  .brand h1 {
    font-size: 16px;
  }

  .brand p {
    display: none;
  }

  #topbar {
    padding: 8px 10px;
  }

  #hud {
    grid-template-columns: 1fr 1fr;
    padding: 10px;
  }

  #hud .meter:nth-child(3) {
    grid-column: 1 / -1;
  }

  #board-wrap {
    padding: 10px;
    border-radius: 16px;
  }

  #toolbar {
    justify-content: center;
  }

  .tool-btn span {
    display: none;
  }

  .tool-btn {
    padding: 10px;
  }

  .tool-spacer {
    display: none;
  }

  .levels-chapter-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 900px) {
  #app {
    padding-top: 20px;
    gap: 14px;
  }

  .meter-val {
    font-size: 26px;
  }

  #board-wrap {
    padding: 26px;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  #aurora,
  #snow {
    display: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}